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Any perfect arrangement is either odd or even, right?
Wrong.

In mathematics, general arrangement refers to the way of arranging a group of elements in a certain order. The number of elements used in odd and even permutations. When the number of permutation elements is even, permutation can be divided into odd permutation and even permutation. Odd arrangement refers to the arrangement with odd inverse logarithm, and even arrangement refers to the arrangement with even inverse logarithm.